Re: Premier Reticles 3-15 useable at low power?
In my experience, one generally needs to have the scope dialed down to low power in order to get an adequate field of view for a target which is relatively close.
Given that, the main crosshairs are what is mostly needed, since the question of using holdoffs is pretty much moot, and there is no problem using the main crosshairs at low powers. In fact, at at 3.4-4 power, you can basically just use the scope tube as a large ghost-ring sight.
I had a Leupold 3.5-10X40M3 with a Premier Gen II reticle, and it pretty much stayed on 10 power all the time. A Leupold 6.5-20X50M1 with that reticle was once used on 6.5 power on a target which was less than 30 yards away. It worked.